用Java写一个简单的学生信息管理系统

好的，下面是一个简单的学生信息管理系统的Java代码：

import java.util.ArrayList;
import java.util.Scanner;

public class StudentManager {
    private ArrayList<Student> students;

    public StudentManager() {
        students = new ArrayList<>();
    }

    public void addStudent(Student student) {
        students.add(student);
    }

    public void removeStudent(String studentId) {
        for (int i = 0; i < students.size(); i++) {
            if (students.get(i).getId().equals(studentId)) {
                students.remove(i);
                break;
            }
        }
    }

    public Student getStudent(String studentId) {
        for (int i = 0; i < students.size(); i++) {
            if (students.get(i).getId().equals(studentId)) {
                return students.get(i);
            }
        }
        return null;
    }

    public ArrayList<Student> getAllStudents() {
        return students;
    }

    public void printAllStudents() {
        for (Student student : students) {
            System.out.println(student);
        }
    }

    public static void main(String[] args) {
        StudentManager manager = new StudentManager();
        Scanner scanner = new Scanner(System.in);

        while (true) {
            System.out.println("请选择要执行的操作：");
            System.out.println("1. 添加学生");
            System.out.println("2. 删除学生");
            System.out.println("3. 查找学生");
            System.out.println("4. 查看所有学生");
            System.out.println("5. 退出");

            int choice = scanner.nextInt();
            scanner.nextLine();

            switch (choice) {
                case 1:
                    System.out.println("请输入学生姓名：");
                    String name = scanner.nextLine();
                    System.out.println("请输入学生学号：");
                    String id = scanner.nextLine();
                    System.out.println("请输入学生性别：");
                    String gender = scanner.nextLine();
                    System.out.println("请输入学生出生日期（格式为yyyy-MM-dd）：");
                    String birthday = scanner.nextLine();
                    Student student = new Student(name, id, gender, birthday);
                    manager.addStudent(student);
                    System.out.println("添加成功！");
                    break;
                case 2:
                    System.out.println("请输入要删除的学生学号：");
                    String removeId = scanner.nextLine();
                    manager.removeStudent(removeId);
                    System.out.println("删除成功！");
                    break;
                case 3:
                    System.out.println("请输入要查找的学生学号：");
                    String searchId = scanner.nextLine();
                    Student searchedStudent = manager.getStudent(searchId);
                    if (searchedStudent == null) {
                        System.out.println("没有找到该学生！");
                    } else {
                        System.out.println(searchedStudent);
                    }
                    break;
                case 4:
                    manager.printAllStudents();
                    break;
                case 5:
                    System.exit(0);
                    break;
                default:
                    System.out.println("输入有误，请重新输入！");
                    break;
            }
        }
    }
}

class Student {
    private String name;
    private String id;
    private String gender;
    private String birthday;

    public Student(String name, String id, String gender, String birthday) {
        this.name = name;
        this.id = id;
        this.gender = gender;
        this.birthday = birthday;
    }

    public String getName() {
        return name;
    }

    public String getId() {
        return id;
    }

    public String getGender() {
        return gender;
    }

    public String getBirthday() {
        return birthday;
    }

    public String toString() {
        return "姓名：" + name + "，学号：" + id + "，性别：" + gender + "，出生日期：" + birthday;
    }
}

这个学生信息管理系统的功能包括添加学生、删除学生、查找学生、查看所有学生和退出程序。每个学生包括姓名、学号、性别和出生日期等信息。

你可以在控制台中运行这个Java程序，按照提示输入相应选项进行操作。